Javascript error - cannot call method 'appendChild' of null

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I am new to Javascript (and programming in general) and have been trying to get a basic grasp on working with the DOM. Apologies if this is a very basic mistake, but I looked around and couldn't find an answer.

I am trying to use the appendChild method to add a heading and some paragraph text into the in the very basic HTML file below.

    <html> 
<head>
    <title>JS Practice</title>  
</head>
<body>
    <script src="script.js"></script> 
    <div id = "main">
        <h1>Simple HTML Page</h1>
        <p>This is a very simple HTML page.</p>
        <p>It's about as basic as they come. It has: </p>
        <ul>
            <li>An H1 Tag</li>
            <li>Two paragraphs</li>
            <li>An unordered list</li>
        </ul>
    </div>
    <div id="javascript">
    </div>
</body>
</html>

Here is the js code:

var newHeading = document.createElement("h1"); 
var newParagraph = document.createElement("p"); 

newHeading.innerHTML = "New Heading!"; 
newParagraph.innerHTML = "Some text for a paragraph."; 

document.getElementById("javascript").appendChild(newHeading); 
document.getElementById("javascript").appendChild(newParagraph); 

Running it causes an error: "Cannot call method 'appendChild' of null"

Help? I can't figure out why this isn't working...

Assuming this code is inside the script.js file, this is because the javascript is running before the rest of the HTML page has loaded.

When an HTML page loads, when it comes across a linked resource such as a javascript file, it loads that resource, executes all code it can, and then continues running the page. So your code is running before the <div> is loaded on the page.

Move your <script> tag to the bottom of the page and you should no longer have the error. Alternatively, introduce an event such as <body onload="doSomething();"> and then make a doSomething() method in your javascript file which will run those statements.

jQuery: Why do get this error: Cannot call method 'call' of undefined , jQuery: Why do get this error: Cannot call method 'call' of undefined? How do you pass code from jQuery to JavaScript (JavaScript, HTML, jQuery, and� Error: cannot call methods on dialog prior to initialization; attempted to call method 'open' 21 jquery ui: cannot call methods on dialog prior to initialization; attempted to call method 'close'

There is an easier way to resolve this issue. Put your JavaScript inside of a function and use the window.onload. So for instance:

window.onload = function any_function_name()
{

var newHeading = document.createElement("h1"); 
var newParagraph = document.createElement("p"); 

newHeading.innerHTML = "New Heading!"; 
newParagraph.innerHTML = "Some text for a paragraph."; 

document.getElementById("javascript").appendChild(newHeading); 
document.getElementById("javascript").appendChild(newParagraph); 
}

Now, you do not have to move your tag because that will run your code after the HTML has loaded.

Get "Type error: cannot call method "toFixed" of null" error message , Javascript method toFixed can only be used with numerical values. The TGML engine in TGML 5.1.7 is stricter than the older versions, so an upgraded script may� function functionCall(dialogFormulario,var1,var2) { //same action dialogFormulario.dialog("close"); } Here it is necessary only to use .dialog(“close”) and no .dialog(“destroy”) because the dialog will call its function close: and the element will not exist

Your script is running before the elements are available.

Place your script directly before the closing </body> tag.

<html> 
<head>
    <title>JS Practice</title>  
</head>
<body>
    <div id = "main">
        <h1>Simple HTML Page</h1>
        <p>This is a very simple HTML page.</p>
        <p>It's about as basic as they come. It has: </p>
        <ul>
            <li>An H1 Tag</li>
            <li>Two paragraphs</li>
            <li>An unordered list</li>
        </ul>
    </div>
    <div id="javascript">
    </div>

    <!-- Now it will run after the above elements have been created -->
    <script src="script.js"></script> 
</body>
</html>

Cannot call method … of null. Solved. #Google-Apps-Script, I found this error is very common for Google-Scripters. When you choose the TypeError: Cannot call method “getRange” of null. (line 6, file� I'm not sure how you can load both libraries without having naming conflicts, but if you can figure that out, make sure you're using MooTools to select the total instead of jQuery. Edit 2 : After a bit of research (I'm unfamiliar with MooTools), I see that you could replace $('total') with:

Your DOM is not loaded, so getElementById will return null, use document.ready() in jquery

   $(document).ready(function(){

    var newHeading = document.createElement("h1"); 
    var newParagraph = document.createElement("p"); 

    newHeading.innerHTML = "New Heading!"; 
    newParagraph.innerHTML = "Some text for a paragraph."; 

    document.getElementById("javascript").appendChild(newHeading); 
    document.getElementById("javascript").appendChild(newParagraph); 

   }

Magento 2: Uncaught Error: cannot call methods on , Magento 2: Uncaught Error: cannot call methods on modal prior to any javascript coode } }] }; $(document).ready(function(){ var popup� The JavaScript exception "is not a function" occurs when there was an attempt to call a value from a function, but the value is not actually a function. Message TypeError: Object doesn't support property or method {x} (Edge) TypeError: "x" is not a function

I add an event listener to wait for DOM content to fully load

document.addEventListener("DOMContentLoaded", function() {
    place_the_code_you_want_to_run_after_page_load
})

magento 2 Error: cannot call methods on priceBox prior to , cannot call methods on priceBox prior to initialization; attempted to call method ' option'. I was try to create price-box-mixin.js to extend mage.priceBox widget. Uncaught TypeError: undefined is not a function. Related errors: number is not a function, object is not a function, string is not a function, Unhandled Error: ‘foo’ is not a function, Function Expected. Occurs when attempting to call a value like a function, where the value is not a function. For example: var foo = undefined; foo();

All Functions are Methods. In JavaScript all functions are object methods. If a function is not a method of a JavaScript object, it is a function of the global object (see previous chapter). The example below creates an object with 3 properties, firstName, lastName, fullName.

This occurs when a link is clicked. This occurs because the escapeDomains function is expecting a domain (text) when in fact it receives an undefined. JavaScript: Uncaught TypeError - Cannot call method 'replace' of undefined [#1113550] | Drupal.org. Skip to main contentSkip to search.

When I ran the latest version of JSDoc on the test file, JSDoc did not generate any errors. My guess is that there's something else going on with some other part of your code. If you can find a standalone test case that's reproducible in the latest version of JSDoc, please file a new issue.